Disclaimer: this is my first electronics project ever. I understand basic electronic components and how they work, but I've never built anything in my life. I thought this project was a good starting point.
I want to build the following "traffic light" circuit that uses two 555 timers to light up three LEDs in sequence:
(Attachment Link)
But...I want to use a dual 556 timer instead of two 555 timers. I attempted to re-draw this circuit with the correct pinouts and removed the extra in/out lines. I don't think I did it right...can anyone help me redraw this so that it would work with a single 556 IC?
Some info on the pinouts for the 555 and 556:
https://dlb.sa.edu.au/rehsmoodle/file.php/466/kpsec.freeuk.com/555timer.htm
Also, would it be a bad idea to build this thing on a mini 170-pin breadboard with no power rails? Is there enough room on one of those to build this?
Thanks for any help you can provide!
You are actually very close to having that circuit right.
For the 555 on the right side, you must have gotten
scrambled up 'cause:
a) the Orange LED circuit high side should come from the left side 555's output ( not 12 volts)
b) pin 8 for the right side 555 should go to 12 volts ( not the left side 555's output )
c) pin 4 for the right side 555 should go to the left side 555's output ( not 12 volts )
I think that should do it.
Let us know how it works out for you,
or if you could use more help.
( post circuits, drawings, wave forms, both from simulation and IRL )
BTW if the right side circuit was in the configuration where you could set the duty cycle,
you would be able to get the periods of the red cycle and green cycle to match almost
exactly -- refer to figure 14 on page 10 in TI's 555 Datasheet -
https://www.ti.com/lit/ds/symlink/lm555.pdf.good luck
and
cheers to all